Help with sudden noise

Discussion in 'Wheels, Tyres, Brakes & Suspension' started by clk320x, Aug 13, 2017.

  1. clk320x

    clk320x MB Club Veteran

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    Took the car out for a drive today after a few days

    Noise coming from what seems like the front left wheel..like a whirring/scraping noise. (Impossible to explain lol ) anyway I pulled over and had a look and it appears the disc is being scored I.e something stuck in the caliper?

    [​IMG]

    Not too sure if that's the issue tho as there isn't anything visibly in it.. I've no idea to be fair. Apart from that the only thing I did differently is washed the wheels using a wheel cleaner the day before (acid free) although I doubt getting that on the brakes could cause an issue?

    The noise gets louder with increased speed

    Thanks
    Abs
     
  2. Stratman

    Stratman Hardcore MB Enthusiast

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    It could well be a bit of gravel stuck between pad and disc.

    Wheel off, pads out, have a look.
     
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  3. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    Cheers mate

    Should be going into Wayne Gates soon to be sorted
     
  4. kid-jensen

    kid-jensen Hardcore MB Enthusiast

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    Try reversing!
     
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  5. noogieman

    noogieman Hardcore MB Enthusiast

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    i have the same score on my disc, i don't hear any noise at all.
    i didn't find any gravel between pad and disc.

    what is causing the disc to score
     
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  6. grober

    grober MB Club Veteran

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    Might be an object/gravel stuck between the disc and the back plate or a damged/bent back plate. Check the hub+disc end float with the cailper in the service position and pads removed--- for wear or roughness in the front bearings. altho bearing wear is usually a lower pitched rumbling sound
     
    Last edited: Aug 14, 2017
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  7. brucemillar

    brucemillar MB Club Veteran

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    As above. Some heavy braking will either dislodge it or push it into the pad where it will eventually get fired out. Worst case is to fit new pads or remove and clean the existing ones. But if removing them? You may as well replace them.
     
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  8. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    [​IMG]

    Looks like suspension has collapsed on front left.. do you see the black bottom part is rubbing... anyone got any ideas?
     
  9. brucemillar

    brucemillar MB Club Veteran

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    Your pic looks normal to me? Have you viewed the other side? You may have a broken spring (very common).
     
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  10. OP
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    clk320x

    clk320x MB Club Veteran

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    [​IMG]

    Otherside there is clearance

    This side the bottom plastic black ring is making contact with the tyre

    I don't understand how this can happen as the car was just parked up for a few days
     
  11. grober

    grober MB Club Veteran

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    Springs often collapse when the car is parked up. This is because spring failure is due to spring internal stress induced during their manufacture. Surface corrosion/cracks after the protective layer is broken then forms a focus for this stress causing sudden failure. In a way they self destruct.
     
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  12. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    thanks for explaining. Does it look like spring failure to you? Shall I order a front spring? Or does it need replacement in pairs?
     
  13. PobodY

    PobodY Hardcore MB Enthusiast

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    I'd replace them in pairs; if one failed the other may not be far behind it.

    Just check that it has failed before you pay to replace it. - Maybe take a wheel off and it should be obvious that either (a) there's a broken piece of spring held down by the bit above it (b) the end of the spring is just a jagged point that doesn't sit neatly in the seat.
     
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  14. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    Going to get RAC to transport to Wayne Gates

    I assume I'll need a flat bed lorry? As an automatic can't be towed 57 miles?
     
  15. grober

    grober MB Club Veteran

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    Difficult to tell from the picture to be honest. The W209 suspension of the strut type so its likely either the strut or the spring has collapsed.
    [​IMG]
    Always a good idea to replace older springs in pairs 1 to retain the same spring rate/ride height side to side 2 failure of one spring is a good indicator the other one may not be long behind it.
    I would suggest you price the option of complete spring + strut unit replacement each side as there's a bit of labour involved in removing the strut then dismantling it on the bench with a spring compressor to fit new springs .
     
  16. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    Looks like that bottom plastic ring is pushing against the wheel

    So I'd assume the spring may have snapped and pushing it down?

    Will phone up MB and find out the parts costs
     
  17. grober

    grober MB Club Veteran

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    Always an idea to cost the MB parts- have your chassis no ready as the spring rates are tailored to the car depending on what equipment is fitted. Wayne Gates may be able to suggest a good quality generic equivalent such as sachs/boge or bilstein which might prove cheaper. always factor the labour costs when doing the calculations mind.
     
  18. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    I'd prefer OEM parts

    MB bridge end quoted £55+VAT for a spring and £150+VAT for front shock

    An unexpected bill anyhow :(
     
  19. Codger49

    Codger49 Hardcore MB Enthusiast

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    Take the advice given at Wayne Gates when you get your car there.

    Think you wil find that Boge/Sachs are original equipment, probably Bilstein too. Don't think MB manufacture springs and shocks themselves.
     
  20. OP
    OP
    clk320x

    clk320x MB Club Veteran

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    Car transported over to Wayne Gates for the front offside suspension issue to be investigated

    [​IMG]

    At least I know it's in good hands with Terry & the team
     
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